[timmypstyle]

Originally Posted by rocky57

I finally checked the mileage on my stock 07 XL, standard cab, 8' bed, V6, auto, 22000 miles, stock wheels and tires. The past week, mixed driving...approx 70 percent highway, but about 100 miles of that with a very non aerodynamic 1000 lb load in my bed, I got 20.6 mpg on 87 octane regular. I normally travel between 65-75 mph on the highway. I was happy with the results.

i just figured the approximate mileage for mine from full till 3/4. got 155 miles on about 6.5 gallons which is 23.85mpg. has 9300 miles and only a cold air intake. also found out the 4.2 is very efficient with the 3.55s at 25 to 35 mph which is 3rd and fourth gears. i went cuising for about 5 miles at those speeds and i am almost positive that is why mine jumped from just over 21 to almost 24mpg